/* CSS Variables for Light and Dark Themes */
:root {
  /* Light Theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #2c3e50;
  --text-secondary: #5a6c7d;
  --text-muted: #8e9bae;
  --primary-color: #27ae60;
  --primary-hover: #219a52;
  --accent-color: #f1c40f;
  --accent-hover: #d4ac0d;
  --border-color: #dee2e6;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --gradient-primary: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
  --gradient-secondary: linear-gradient(135deg, #f1c40f 0%, #f39c12 100%);
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2c2c2c;
  --bg-tertiary: #3d3d3d;
  --text-primary: #ffffff;
  --text-secondary: #b8b8b8;
  --text-muted: #888888;
  --primary-color: #2ecc71;
  --primary-hover: #27ae60;
  --accent-color: #f39c12;
  --accent-hover: #e67e22;
  --border-color: #404040;
  --shadow-light: rgba(255, 255, 255, 0.1);
  --shadow-medium: rgba(255, 255, 255, 0.15);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Source Sans 3', sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: all 0.3s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.75rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Section Headers */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--primary-color);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(26, 26, 26, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-brand span {
  font-family: 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-color);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  border-color: var(--primary-color);
  transform: scale(1.1);
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  margin: 3px 0;
  transition: 0.3s;
  border-radius: 3px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: white;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -2;
}

.hero-background img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-background::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(39, 174, 96, 0.8), rgba(46, 204, 113, 0.6));
  z-index: -1;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 2rem;
}

.hero-title {
  color: white;
  margin-bottom: 1.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2.5rem;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* About Section */
.about {
  background: var(--bg-secondary);
}

.about-content {
  display: grid;
  gap: 4rem;
}

.about-text {
  font-size: 1.1rem;
  line-height: 1.8;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.value-item {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 20px var(--shadow-light);
  transition: transform 0.3s ease;
}

.value-item:hover {
  transform: translateY(-5px);
}

.value-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* Products Section */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--bg-primary);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow-light);
  transition: transform 0.3s ease;
}

.product-card:hover {
  transform: translateY(-5px);
}

.product-image {
  height: 200px;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-content {
  padding: 1.5rem;
}

.product-content h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

/* Sustainability Section */
.sustainability {
  background: var(--bg-secondary);
}

.sustainability-content {
  display: grid;
  gap: 3rem;
}

.sustainability-text {
  font-size: 1.1rem;
  line-height: 1.8;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat-item {
  text-align: center;
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--shadow-light);
}

.stat-value {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.stat-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.stat-progress {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 4px;
  transition: width 2s ease;
}

/* Why Us Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-item {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 20px var(--shadow-light);
  transition: transform 0.3s ease;
  border-top: 4px solid var(--primary-color);
}

.feature-item:hover {
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* Testimonials Section */
.testimonials {
  background: var(--bg-secondary);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--shadow-light);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: 20px;
  font-size: 4rem;
  color: var(--primary-color);
  font-family: Georgia, serif;
}

.testimonial-content {
  margin-bottom: 1rem;
}

.testimonial-author {
  color: var(--primary-color);
  font-weight: 600;
}

/* FAQ Section */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-primary);
  border-radius: 8px;
  margin-bottom: 1rem;
  box-shadow: 0 2px 10px var(--shadow-light);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1.5rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.3s ease;
}

.faq-question:hover {
  background: var(--bg-secondary);
}

.faq-icon {
  font-size: 1.5rem;
  color: var(--primary-color);
  transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer.active {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 1.5rem 1.5rem;
  margin: 0;
}

/* Insights Section */
.insights {
  background: var(--bg-secondary);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.insight-card {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--shadow-light);
  transition: transform 0.3s ease;
  border-left: 4px solid var(--accent-color);
}

.insight-card:hover {
  transform: translateY(-5px);
}

.insight-content h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

/* Contact Section */
.contact-form-container {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--shadow-light);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-error {
  display: block;
  color: #e74c3c;
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Footer */
.footer {
  background: var(--bg-tertiary);
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.footer-brand span {
  font-family: 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.footer-brand p {
  color: var(--text-muted);
  margin: 0;
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-primary);
  border-radius: 50%;
  text-decoration: none;
  transition: transform 0.3s ease;
}

.footer-social a:hover {
  transform: scale(1.1);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.footer-lang select {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.5rem;
}

/* Toast Notification */
.toast {
  position: fixed;
  top: 90px;
  right: 20px;
  background: var(--primary-color);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 20px var(--shadow-medium);
  transform: translateX(400px);
  transition: transform 0.3s ease;
  z-index: 1001;
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 350px;
}

.toast.show {
  transform: translateX(0);
}

.toast-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .container {
    padding: 0 15px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    min-width: 200px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 2rem;
    transition: left 0.3s ease;
    border-top: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero {
    height: 80vh;
  }
  
  .hero-content {
    padding: 1rem;
  }
  
  .section {
    padding: 40px 0;
  }
  
  .values-grid,
  .products-grid,
  .features-grid,
  .testimonials-grid,
  .insights-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
  
  .footer-content,
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .toast {
    right: 10px;
    left: 10px;
    max-width: none;
    transform: translateY(-100px);
  }
  
  .toast.show {
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 10px;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
    min-width: 180px;
  }
  
  .value-item,
  .product-card,
  .feature-item,
  .testimonial-card,
  .insight-card {
    padding: 1.5rem;
  }
  
  .contact-form {
    padding: 1.5rem;
  }
}

/* Animation Classes */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Focus Styles for Accessibility */
button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.5);
  }
  
  .btn {
    border: 2px solid;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}